There's got to be more to this story When you say bad gas what do you mean? Old gas that had been sitting around the garage? Diesel? In any event draining the tank would be your first-step, you may need to have it cleaned-out as well. You should have the fuel filter changed as well. Good luck!
We have figured the prob out, it's the fuel injectors there clogged. Now need know how to unclog them. We have very little money so buying new ones right now I can't do.